goodwill ambassador

noun
🔊/ˌɡʊdwɪl æmˈbæsədə(r)/
🔊/ˌɡʊdwɪl æmˈbæsədər/
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  1. a famous person who represents an organization by educating the public or promoting a good relationship with the public
    • The singer is a goodwill ambassador for the American Heart Association.这位歌手是美国心脏协会的亲善大使。